Encrypt the message \"your grade\" using the cipher with key. \"At TSU\". Ignore
ID: 3815697 • Letter: E
Question
Encrypt the message "your grade" using the cipher with key. "At TSU". Ignore the space between words. Please state the details of how you get corresponding ciphers text by including (1) the values of the plain text; (2) the value of key stream; (3) the value of the corresponding cipher text; and then (4) the final result of the corresponding cipher text. Use the Play fair cipher or encipher the message "Hello TSU". The can be made by filling the first and part of the second now with the word "computer the test of the matrix with the rest of the alphabet. What is the key for this Play air cipher? Please state the details of how you get the corresponding cipher text by the including pairs; and then (3) the final result of the corresponding cipher text.Explanation / Answer
problem1
Plain text: Your grade
Key: ATTSU
Step 1:
Write key value for your plain text (in cyclic manager for each plain text character) in following way
Plain Text
y
o
u
r
g
r
a
d
E
keyword
a
t
t
s
u
a
t
t
s
Cipher text: using vigenere table
To encrypt, pick a letter in the plaintext and its corresponding letter in the keyword, use the keyword letter and the plaintext letter as the row index and column index, respectively, and the entry at the row-column intersection is the letter in the vigenere table
Example :
Finding in table for
Row = y column =a
Row = 0 column =t
Row = u column =t
Row = r column =s
Soon
……
Plain Text
y
o
u
r
g
r
a
d
E
keyword
a
t
t
s
u
a
t
t
s
Cipher
y
h
n
j
a
r
t
w
w
Cipher will be : yhnj artww
Plain Text
y
o
u
r
g
r
a
d
E
keyword
a
t
t
s
u
a
t
t
s
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